Emergency electrical power

Example of the Beta-Factor Method Emergency Electric Power... 

Example Analyzing an Emergency Electric Power System... 

Fault Tree diagram of the emergency electric power system. F... 

TABLE I. EMERGING ELECTRIC POWER DISTRIBUTION-GENERATION TECHNOLOGIES... 

At Anniston and Umatilla, diesel-powered emergency electrical power systems sized to handle the power require-... 

A speciality market exist in the aviation sector for engine start-up and emergency electrical power supply. Space and defence represent minor but stable market segments. 

Structures, systems and components important to safety vhich are installed as redundant items, or are called upon when normal operating conditions are threatened or lost, are normally kept in standby or off-line states. Examples of such SSCs are reactor containment vessels, emergency electric power sources, isolation valves and safety valves. Some of these SSCs cannot be monitored in situ for their operating reliability. Testing and surveillance for the actual conditions under which they are expected to operate, and which are generally difficult or impossible to reproduce, are usually undertaken under simulated conditions. These simulated conditions should be carefully planned, and the results should be interpreted prudently. 

Safety Series No. 50-SG-D7, Emergency Electrical Power Systems at Nuclear Power Plants (1991). 

Most HWRs have two sources of emergency electrical power Group 1 Class III diesels and separate, independent, seismically qualified Group 2 Class III diesels. This greatly reduces the risk of station blackout. 

TABLE 5.42 Emergency Electric Power Supplies—Load Tabulations for Example Location or Building (Onan-Fridley) Nominal Voltage 120/208, Frequency 60 Hz... 

The necessity for engineered safety features shall be determined from the safety analysis. The accidents with which these systems must be able to cope shall be specified and analyses shall be provided to demonstrate that the systems fulfil the requirements. Those systems and subsystems that are essential for the proper operation of the engineered safety features shall be provided (e.g. the emergency electrical power supply for the emergency core cooling system). 

The provision of an emergency electrical power system with adequate reliability to ensure the availabiUty of emergency electrical power when it is required for systems important to safety shall be considered. 

In the design of an emergency electrical power system, the starting load requirements of the various items of equipment served by the system shall be taken into account. 

The design of a spent fuel storage facility shall provide for emergency electrical power if the loss of normal electrical supplies could adversely affect safe conditions, physical security or the operation of safeguards equipment. 

Safety assessment of emergency electric power systems for nuclear power plants 1986... 

The starboard side pontoon carries the auxiliary equipment such as standby and emergency electric power sources and pumps. 

The plant shall be designed to operate safely within a defined range of parameters (for example, of pressure, temperature, power), and a minimirm set of specified support features for safety systems (for example, auxiliary feedwater capacity and an emergency electrical power supply) shall be assumed to be available. The design shall be such that the response of the plant to a wide range of anticipated operational occurrences will allow safe operation or shutdown, if necessary, without the necessity of invoking provisions beyond the first, or at the most the second, level of defence in depth. 

Class III power. Diesel generated emergency electric power. There are two independent and widely separated sets of Class III diesels Group 1 diesels and Group 2 diesels. The latter are seismically qualified. 

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